Introduce dummy as second XMPP implementation

It is currently evaluated if it is worth a trial to drop libstrophe as a
dependency and use a raw TCP connection and a XML library like expat to
implement the XMPP part. This would have the following advantages:

- fewer dependencies
- learning more about XMPP itself and less about libstrophe
- slower, but maybe easier implementation (XMPP doc is far more readable
  / extensive)

Because of these reasons the `limox_sdl2` version was switched to a
dummy XMPP implementation `xmpp.c` which acts now as a test field for
XMPP hacking.

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